A web page and interactive (Flash) applet demonstrating the reflection transformation. Drag the vertices of a triangle and re-position the line of reflection. The reflected image of the triangl...More: lessons, discussions, ratings, reviews,...

Practice transformations (reflection, rotation, and translation). Then try your hand at the game - figure out how to transform the shape to match the target shape. Reflections are over the x- and y-...More: lessons, discussions, ratings, reviews,...

A Geometer's Sketchpad tool for constructing distorted images that can be viewed undistorted with a cylindrical mirror. The file contains tabbed pages with several images, a grid for students to draw...More: lessons, discussions, ratings, reviews,...

In this activity, students create their own Sketchpad kaleidoscopes. In the process, they learn about rotation and reflection, as well as gaining some skill using Sketchpad's transformation features.More: lessons, discussions, ratings, reviews,...

The idea of this activity is to introduce students to some of the basic transformational behaviors. The emphasis is less on properties than on relationships between objects that have been reflected, r...More: lessons, discussions, ratings, reviews,...

This is the junior version of Geom-e-Tree. It enables the manipulation of geometric trees with two or three branches. Change angle between branches and change common ratio. Selectable themes draw ...More: lessons, discussions, ratings, reviews,...

This material is based upon work supported by the
National Science Foundation under Grant DUE-0226284.
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National Science Foundation.